Accumulator grid or plate



J. Mm. EURNEZTT AGCUMULATOR GRID OR PLATE was. 8, 1925.

Filed May 6. 1924 Patented Dec. 8, 1925.

UNITED STATES JAMES MCDONALD BURNETT oF WESTON-BY-WELLAND, ENGLAND.

AGCUMULATOR GRID OR PLATE.

Application filed May 6,

To all whom it may concern Be it known that I, ,JAMES MCDONALD BURNETT,a subject of the King of Great Britain, and resident oflVeston-by-VVelland, in the county of Northampton, England, haveinvented a certain new and useful Improvement in or Relating toAccumulator Grids or Plates, of which the follow ing is a specification.

This invention relates to accumulator grids or plates.

One object of the invention is the provision of a cast unit of lead orlead alloy which can, together with a number of like units, be easilyand economically built up to form a complete accumulator plate or gridof any desired dimensions.

Another object is the provision, upon an economic scale, of anaccumulator plate or grid of lead or lead alloy which will be strong,rigid and not subject to bending.

Another object is the provision, upon an economic scale, of anaccumulator plate of lead or lead alloy which will comprise rigidifyingreinforcement but which. at the same time, will have the whole of itsexposed surface active.

Other objects and advantages will appear hereinafter.

Certain embodiments of the invention are illustrated in the accompanyingdrawings and the same will now be described, it being understood thatthe particular constructions and arrangements illustrated and describedare susceptible of various modifications without departing from thescope of the appended claim.

In these drawings Figures 1 to 3 are perspective and cross sectionalviews of three examples of units from which accumulator plates areadapted to be built up.

Figure 4: is a side elevation of an accumulator plate built up fromunits such as that illustrated in Figure 1.

Figure 5 is a cross section of the same taken on the line 5-5 of Figure4, and

Figure 6 is a cross section of an accumulator plate built up from unitssuch as that illustrated in Figure 3.

In Figure l a simple unit is illustrated consisting of a cast squarelead plate having around its edge a symmetrical groove 1 adapted, aswill hereinafter appear, to accommodate a material for binding a num-1924. Serial No. 711,466.

ber of such units together edge to edge.=

The unit is also provided with nine straight sided perforations 2adaptedto accommodate the paste.

The unit illustrated in Figure 2 is similar to that illustrated inFigure 1 except for the fact that the perforations 2 are bevelled asshown so that a greater exposed area of paste can be obtained withoutthe units being unduly weakened.

The unit illustrated in Figure 3 is simi lar to that illustrated inFigure 1 except for the fact that the edges instead of being groovedsymmetrically are recessed as shown to one side, for the purpose, aswill hereinafter appear, of enabling accumulator plates of double thethickness of the units to be built up.

In the case of any of these units grooves or corrugations suitable forPlant type accumulators may be substituted for the perforations 2.

Referring now to Figures 4 and 5, the plate here illustrated comprises anumber of units such as that illustrated in Figure 1 though units inaccordance with Figure 2 may be equally well used.

The perforations 2 are packed with accumulator paste 4t and the unitsare held together in the co-relation illustrated by means of some rigidacid proof conductor such as antimonial lead (which is of greaterrigidity than lead) castinto the grooves l and also extending beyond theoutside units so as to form a strengthening frame 5 around the edge ofthe plate and a lug 6 by which to attach the plate in position in theaccumulator.

In the process of construction of the plate the units are preferablyloaded with the accumulator paste while still separate and are thenarranged in position edge to edge in a suitable mould. In such positionthe grooves 1, as will be clear from the drawing, together form aconcealed network of inter-communicating intersecting channels extendingthroughout the whole extent of the plate.

The antimonial lead is then poured or forced into this mould so that itpercolates through, and solidified within, the said network of channels,and also forms the frame "5 and lug 6. As will be obvious both the saidframe 5 and that part of the antimonial lead which is cast within theintersecting channels constitute a stiffening reinforcement for theplate as well as a connecting means to hold the units thereof together.

Referring to Figure 6 the plate illustrated comprises a number of unitssuch as that illustrated in Figure 3. It is clear from this latterfigure that complete symmetrical grooves are formed by placing a pair ofthe units face to face and as is clearly shown in Figure 6 the completeplate is built up of a number of these units arranged so that such pairsare edge to edge with one another. Otherwise, in respect both of itsform and the manner in which it is constructed, the plate illustrated inFigure 3 is similar to that illustrated in Figures 1 and 2.

In both the above described embodiments of accumulator plate it maysometimes be found preferable to apply the accumulator paste after, andnot before the units have been cemented together.

What I claim and desire to secure by Letters Patent is An accumulatorplate comprising a plurality of individual unit plates of soft lead,formed each with edge grooves and cone lated so that said groovesco-operate to form a hidden network of communicating and intersectingchannels running throughout the extent of said accumulator plate, and aconcealed framework of rigid conducting material cast Within saidcommunicating and intersecting channels and thereby rigidly securingsaid unit plates together, whereby the whole exposed surface of saidaccumulator plate is of soft lead but the strength there of resides inthe rigid concealed framework.

In witness whereof I afiix my signature.

JAMES MCDONALD BURNETT.

